mirror of https://github.com/k3s-io/k3s
126 lines
4.7 KiB
Go
126 lines
4.7 KiB
Go
/*
|
|
Copyright 2017 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package server
|
|
|
|
import (
|
|
"github.com/containerd/containerd"
|
|
"github.com/containerd/containerd/errdefs"
|
|
"github.com/containerd/containerd/log"
|
|
"github.com/docker/docker/pkg/system"
|
|
"github.com/pkg/errors"
|
|
"golang.org/x/net/context"
|
|
runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
|
|
|
|
"github.com/containerd/cri/pkg/store"
|
|
containerstore "github.com/containerd/cri/pkg/store/container"
|
|
)
|
|
|
|
// RemoveContainer removes the container.
|
|
// TODO(random-liu): Forcibly stop container if it's running.
|
|
func (c *criService) RemoveContainer(ctx context.Context, r *runtime.RemoveContainerRequest) (_ *runtime.RemoveContainerResponse, retErr error) {
|
|
container, err := c.containerStore.Get(r.GetContainerId())
|
|
if err != nil {
|
|
if err != store.ErrNotExist {
|
|
return nil, errors.Wrapf(err, "an error occurred when try to find container %q", r.GetContainerId())
|
|
}
|
|
// Do not return error if container metadata doesn't exist.
|
|
log.G(ctx).Tracef("RemoveContainer called for container %q that does not exist", r.GetContainerId())
|
|
return &runtime.RemoveContainerResponse{}, nil
|
|
}
|
|
id := container.ID
|
|
|
|
// Set removing state to prevent other start/remove operations against this container
|
|
// while it's being removed.
|
|
if err := setContainerRemoving(container); err != nil {
|
|
return nil, errors.Wrapf(err, "failed to set removing state for container %q", id)
|
|
}
|
|
defer func() {
|
|
if retErr != nil {
|
|
// Reset removing if remove failed.
|
|
if err := resetContainerRemoving(container); err != nil {
|
|
log.G(ctx).WithError(err).Errorf("failed to reset removing state for container %q", id)
|
|
}
|
|
}
|
|
}()
|
|
|
|
// NOTE(random-liu): Docker set container to "Dead" state when start removing the
|
|
// container so as to avoid start/restart the container again. However, for current
|
|
// kubelet implementation, we'll never start a container once we decide to remove it,
|
|
// so we don't need the "Dead" state for now.
|
|
|
|
// Delete containerd container.
|
|
if err := container.Container.Delete(ctx, containerd.WithSnapshotCleanup); err != nil {
|
|
if !errdefs.IsNotFound(err) {
|
|
return nil, errors.Wrapf(err, "failed to delete containerd container %q", id)
|
|
}
|
|
log.G(ctx).Tracef("Remove called for containerd container %q that does not exist", id)
|
|
}
|
|
|
|
// Delete container checkpoint.
|
|
if err := container.Delete(); err != nil {
|
|
return nil, errors.Wrapf(err, "failed to delete container checkpoint for %q", id)
|
|
}
|
|
|
|
containerRootDir := c.getContainerRootDir(id)
|
|
if err := system.EnsureRemoveAll(containerRootDir); err != nil {
|
|
return nil, errors.Wrapf(err, "failed to remove container root directory %q",
|
|
containerRootDir)
|
|
}
|
|
volatileContainerRootDir := c.getVolatileContainerRootDir(id)
|
|
if err := system.EnsureRemoveAll(volatileContainerRootDir); err != nil {
|
|
return nil, errors.Wrapf(err, "failed to remove volatile container root directory %q",
|
|
volatileContainerRootDir)
|
|
}
|
|
|
|
c.containerStore.Delete(id)
|
|
|
|
c.containerNameIndex.ReleaseByKey(id)
|
|
|
|
return &runtime.RemoveContainerResponse{}, nil
|
|
}
|
|
|
|
// setContainerRemoving sets the container into removing state. In removing state, the
|
|
// container will not be started or removed again.
|
|
func setContainerRemoving(container containerstore.Container) error {
|
|
return container.Status.Update(func(status containerstore.Status) (containerstore.Status, error) {
|
|
// Do not remove container if it's still running or unknown.
|
|
if status.State() == runtime.ContainerState_CONTAINER_RUNNING {
|
|
return status, errors.New("container is still running, to stop first")
|
|
}
|
|
if status.State() == runtime.ContainerState_CONTAINER_UNKNOWN {
|
|
return status, errors.New("container state is unknown, to stop first")
|
|
}
|
|
if status.Starting {
|
|
return status, errors.New("container is in starting state, can't be removed")
|
|
}
|
|
if status.Removing {
|
|
return status, errors.New("container is already in removing state")
|
|
}
|
|
status.Removing = true
|
|
return status, nil
|
|
})
|
|
}
|
|
|
|
// resetContainerRemoving resets the container removing state on remove failure. So
|
|
// that we could remove the container again.
|
|
func resetContainerRemoving(container containerstore.Container) error {
|
|
return container.Status.Update(func(status containerstore.Status) (containerstore.Status, error) {
|
|
status.Removing = false
|
|
return status, nil
|
|
})
|
|
}
|